CN114632912B - Pipeline gate valve body casting process method - Google Patents
Pipeline gate valve body casting process method Download PDFInfo
- Publication number
- CN114632912B CN114632912B CN202011483506.4A CN202011483506A CN114632912B CN 114632912 B CN114632912 B CN 114632912B CN 202011483506 A CN202011483506 A CN 202011483506A CN 114632912 B CN114632912 B CN 114632912B
- Authority
- CN
- China
- Prior art keywords
- sand
- riser
- valve body
- placing
- casting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
本发明涉及一种管道闸阀体铸造工艺方法，将阀体沿流道最大直径面分成上下两部分，上部法兰两侧设置明冒口，明冒口之间只用冷铁分区，阀体内腔设置暗冒口，借助加强筋结构实现暗冒口补缩中法兰。该铸造工艺全部采用底注方式，实现钢液平稳、快速充型。通过AOD炉实现钢水去气去渣的作用，产品经过RT检验达到标准。本发明减少冒口数量，提高冒口补缩效率，工艺出品率达到58％，提高了产品的外观和内在质量，大大降低了生产成本，提高生产效率。
The invention relates to a pipeline gate valve body casting process. The valve body is divided into upper and lower parts along the maximum diameter surface of the flow channel. Open risers are provided on both sides of the upper flange. Only cold iron is used to divide the open risers. The valve body cavity Set up a concealed riser, and use the reinforcing rib structure to realize the concealed riser feeding middle flange. This casting process all adopts bottom injection method to achieve smooth and rapid filling of molten steel. The AOD furnace is used to degas and slag the molten steel, and the products meet the standards after RT inspection. The invention reduces the number of risers, improves riser feeding efficiency, and the process yield reaches 58%, improves the appearance and intrinsic quality of the product, greatly reduces production costs, and improves production efficiency.
Description
Technical Field
The invention relates to a casting method of a pipeline gate valve body, in particular to a casting method of a large-caliber low-pound gate valve body.
Technical Field
There are many strengthening ribs in the low pound level gate valve body structure, and the strengthening rib is the solidification hot festival with the valve body contact place, and the hot festival disperses, leads to the feeding difficulty. The concrete process in the prior art is shown in fig. 1-3, the maximum surface of the valve body is perpendicular to the middle flange to serve as a parting surface, the whole product is divided into an upper part and a lower part, a plurality of open risers are arranged on the upper part, the middle flange is a blind riser, a chiller is arranged between the risers according to a feeding principle, a sprue is connected with a runner, the runner is connected with the blind riser, and molten steel flows in from the middle parting surface. The molding scheme adopts a template molding, an upper template is divided, a lower template is molded, and the casting scheme is simple to operate.
The prior casting technology has the following problems: (1) The open riser is arranged on the arc surface, the whole feeding is carried out along the arc direction, meanwhile, the hot joints are dispersed, and the feeding efficiency of the open riser and the blind riser is poor; (2) The heat joint in the middle of the reinforcing rib on the middle flange cannot be effectively fed due to the blocked feeding channel, and the heat joint can be reduced only through the chiller, so that the shrinkage problem cannot be fundamentally solved; (3) In the casting mode of the split surface, turbulent flow condition appears in the cavity in the casting process of the product, and the integral slag inclusion is serious; (4) The feeder head of the scheme has low multi-process product yield, large cutting and polishing amount and high production cost.
Disclosure of Invention
The invention aims to mainly solve the problems of high quality defect rate, low yield and high cost of the existing casting process, and develops a casting method of high-quality gate valve bodies with high-efficiency feeding, high yield, good quality and low cost.
In order to achieve the above purpose, the present invention adopts the following technical scheme, and specific process schematic diagrams are shown in fig. 4 to 6:
the product is divided into an upper part and a lower part along the maximum diameter surface of the product, the middle flange is positioned at the lower part of the model, and the parting surface is parallel to the end surface of the flange; the upper part adopts a solid model added plate modeling, and directly flows sand modeling; the lower part and the middle flange are molded by adopting an integral model and a plate;
according to the casting modulus calculation method, open riser is arranged at the upper part, open riser zone chilling blocks are arranged between the open riser and used for dividing a product solidification area into two parts;
two blind risers are arranged in the inner cavity of the valve body, and the blind risers realize the function of a flange in feeding through the reinforcing ribs;
the pouring system adopts a complete bottom pouring type, a sprue is connected with a runner, a connecting sprue enters a cavity through a middle flange, and two sprue are arranged on the end face of the middle flange according to calculation;
before the box closing, sand scattering and other sundries in the cavity are treated cleanly by an industrial dust collector, so that the dryness of the cavity is ensured;
using an endoscope to check the cavity and the pouring channel before closing the box, so as to ensure that each position is clean;
the molten steel is smelted through an intermediate frequency furnace and an AOD, so that gas and slag inclusion in the molten steel are removed, and the quality of the molten steel is ensured;
through MT and RT inspection, the appearance quality and the internal quality of the product are ensured to meet the standards;
compared with the prior art, the invention has the following technical advantages:
1) The open riser is distributed reasonably, and the dead head is partitioned, so that the riser feeding efficiency is effectively improved, and the number of open risers is reduced;
2) The blind riser is arranged at the hot joint of the inner cavity, the feeding gradient of the product is realized by utilizing the structure of the reinforcing ribs, the feeding is not required to be added, and the feeding efficiency of the blind riser is improved through the partition of the blind riser and the blind riser;
3) The inner pouring gate is arranged on the end face of the middle flange, so that stable filling is realized, turbulent flow of molten steel in the cavity is avoided, and the pouring quality of secondary oxidizing slag and nonmetallic slag inclusion of the molten steel is greatly improved;
4) The number of the riser is reduced, the yield is improved to 58% by 40% originally, and the production cost is greatly reduced;
5) The riser cutting amount, the gouging amount and the polishing amount are greatly reduced, the production efficiency of the product is improved by 30%, and the production process cost is reduced.
Drawings
FIG. 1 is a schematic diagram of a prior art parting scheme;
FIG. 2 prior art riser profile;
FIG. 3 prior art gating system and riser distribution diagram;
FIG. 4 is a schematic diagram of a product typing scheme of the present invention;
FIG. 5 shows riser distribution in the present invention;
FIG. 6 is a diagram showing distribution of pouring system and blind riser in the present invention;
in the figure: 1 prior art parting product upper part, 2 prior art product middle flange, 3 prior art product lower part, 4 prior art blind riser, 5 prior art chill, 6 prior art open riser, 7 prior art sprue, 8 prior art runner, 9 inventive product upper part, 10 inventive product lower part, 11 of the invention, 12 of the invention is an external partition chill, 13 of the invention is a open riser, 14 of the invention is a runner, 15 of the invention is an internal runner, 16 of the invention is a blind riser, 17 of the invention is an inner cavity partition chill, 18 of an upper sand mold, 19 of a lower sand mold, 20 of a rib plate sand core and 21 of an inner cavity sand core.
Specific measures
The following describes the specific implementation of the present invention in detail with reference to the accompanying drawings:
1) As shown in fig. 4, the product structure is analyzed, parting is performed along the maximum diameter, the parting surface is parallel to the middle flange 2, and the product is divided into an upper part 9, a lower part 10 and the middle flange 2;
2) The lower part 10 and the model of the middle flange 2 are placed on a modeling platform together, and a pouring gate 15 of a pouring system is selectedPorcelain tube, runner 14 and sprue 13Select->Placing the porcelain tube on a model according to a process diagram, placing a sand box for sand flowing operation, enhancing the compactness of molding sand in the operation process, turning the sand box for 180 degrees after the molding sand is hardened, stripping, repairing and brushing;
3) Placing the upper model on a molding platform, placing a riser 12 and a chill 11, then placing a sand box, placing a sprue 13 in a position corresponding to a process diagram, integrally casting sand for molding, taking the model out of a cavity after molding sand is hardened, repairing and brushing;
4) Setting chill and blind riser 16 in an inner cavity sand core 21 according to a process, preparing the sand core inner cavity 21 by using flowing sand, simultaneously preparing a rib plate sand core 20, enhancing the compactness operation in the sand core preparation process, and setting an air outlet rope in the sand core to ensure smooth air outlet in the sand core pouring process, and brushing for later use after the sand core is hardened;
5) After the sand mold and the sand core are completely prepared, pressing down the core, assembling the box, smelting and pouring, casting the box, cleaning the sand, cutting, heat treating and processing to obtain a qualified valve body casting;
the foregoing is a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, may substitute or change the technical solution according to the present invention and the idea of the present invention, is included in the scope of the present invention.
Claims (1)
1. A casting process method of a pipeline gate valve body is characterized by comprising the following steps:
1) Analyzing the product structure, parting along the maximum diameter, wherein the parting surface is parallel to the middle flange (2), dividing the product into an upper part (9), a lower part (10) and the middle flange (2), and the scheme of a riser and a pouring system is as follows:
according to the casting modulus calculation method, open riser is arranged at the upper part, open riser zone chilling blocks are arranged between the open riser and used for dividing a product solidification area into two parts;
two blind risers are arranged in the inner cavity of the valve body, and the blind risers realize the function of a flange in feeding through the reinforcing ribs;
the pouring system adopts a complete bottom pouring type, a sprue is connected with a runner, a connecting sprue enters a cavity through a middle flange, and two sprue are arranged on the end face of the middle flange according to calculation;
2) The lower part (10) and the model of the middle flange (2) are placed on a modeling platform together, and a pouring gate (15) in a pouring system is selectedPorcelain tube, cross gate (14) and straight gate (13) are selected from +.>Placing the porcelain tube on a model according to a process diagram, placing a sand box for sand flowing operation, enhancing the compactness of molding sand in the operation process, turning the sand box for 180 degrees after the molding sand is hardened, stripping, repairing and brushing;
3) Placing the upper model on a molding platform, placing a riser (12), a chill (11), then placing a sand box, placing a sprue (13) at a position corresponding to a process diagram, molding by integral sand flow, taking the model out of a cavity after molding sand is hardened, repairing and brushing;
4) Setting chill and blind riser in an inner cavity sand core (21) according to a process, preparing the inner cavity sand core (21) by using flowing sand, preparing a rib plate sand core (20) at the same time, reinforcing compaction degree operation in the sand core preparation process, arranging an air outlet rope in the sand core, ensuring smooth air outlet in the sand core pouring process, and brushing for later use after the sand core is hardened;
5) After the sand mould and the sand core are completely prepared, the qualified valve body casting is obtained by pressing down the core, closing the box, smelting and casting, casting and sand cleaning, cutting and heat treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011483506.4A CN114632912B (en) | 2020-12-16 | 2020-12-16 | Pipeline gate valve body casting process method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011483506.4A CN114632912B (en) | 2020-12-16 | 2020-12-16 | Pipeline gate valve body casting process method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114632912A CN114632912A (en) | 2022-06-17 |
| CN114632912B true CN114632912B (en) | 2023-09-08 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011483506.4A Withdrawn - After Issue CN114632912B (en) | 2020-12-16 | 2020-12-16 | Pipeline gate valve body casting process method |
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| Country | Link |
|---|---|
| CN (1) | CN114632912B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116037884A (en) * | 2022-12-20 | 2023-05-02 | 共享铸钢有限公司 | Casting method of assembly shaft |
| CN117139563B (en) * | 2023-08-25 | 2024-05-24 | 江苏万恒铸业有限公司 | A precision casting equipment and casting process of monel nozzle |
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2020
- 2020-12-16 CN CN202011483506.4A patent/CN114632912B/en not_active Withdrawn - After Issue
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| Publication number | Publication date |
|---|---|
| CN114632912A (en) | 2022-06-17 |
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Effective date of registration: 20250812 Address after: No. 8 Century Avenue, Binhai County Economic Development Zone, Yancheng City, Jiangsu Province, China 224000 Patentee after: Jiangsu Wanheng New Material Technology Co.,Ltd. Country or region after: China Address before: 224500 No.9 Century Avenue, North Industrial Park, Binhai Economic Development Zone, Yancheng City, Jiangsu Province Patentee before: JIANGSU WANHENG CASTING INDUSTRY Co.,Ltd. Country or region before: China |
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| TR01 | Transfer of patent right | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20230908 Effective date of abandoning: 20251121 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20230908 Effective date of abandoning: 20251121 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |